Good? Yep. Surprisingly.
Good:
-A small amount of weapons, more than Brothers in Arms
-Looks great
-Single card play
-Campaign has multiple settings, quick play mode
-There's a shotgun
-Nonlinear level design
-Fun
Bad:
-Campaign relatively short
-AI looks exactly the same
-No Wi-Fi
Can a FPS on the DS have good graphics? Sure. MPH and CoD 4 DS can prove it. I really liked the enemies, and the environments. Even vehicles looked somewhat nice. The enemies look good too. There's even blood when you shoot, as well as dust from vehicles. Some bad things about the graphics: 1.Almost all of the levels were based on right angles. It got a little boring after a while. 2. The guns looked weak, but only when you zoomed, or fired. It was a 2d image when you zoomed, and a shot was just varying yellow shapes. 3. A lot of enemies look exactly the same.
Graphics: 8/10
The campaign is surprisingly long, but still short. If you played Brothers in Arms DS, this is at least 2 hours longer. I would say it took me 6-8 hours to beat it. 3 difficulty settings also help increase the hour time. If you beat the game on all settings, you would get close to 20 hours. I also liked how there were different weapons, more than Brothers in Arms and MPH. There's also a shotgun. If GS were on the old rating system, that would bring it up a point or two.
The campaign also had a nonlinear design about half of the time. I think that is crucial. I also liked the variation of levels, from helicopters to trucks. There were also minigames in there, too.
Single player: 8/10
While the music consists of only a few tracks, they are all good, and fit the mood. The voice acting is surprisingly well done; I think this is the best on the DS. Cries of pain and shooting guns make a great appearance as well. The thing that surprises me the most is that the DS has crappy speakers, but a lot of games' sound…sounds good.
Sound: 8.5/10
The multiplayer is by far the thing that brings the game down. A Call of Duty game with no online? What? Really, as long as they had matched, or passed up (which would have been easy) MPH, this game would have gotten an 8 from GS. The multiplayer I have played is fun, as long as the other person knows what they're doing. There are a few maps with single card, as well as different characters (I think there's five or six). Fun multiplayer is here, but not much of it.
Multiplayer: 7/10
It's easy to just pick up and play Call of Duty 4 DS. It may be intense, but the 5 minute tutorial literally allows you to take this out of the box and play it. It's a lot of fun, but sometimes the AI stands still. There's not many ways to achieve a goal, usually it's just one. Different weapons for each enemy, as well as soldier you play as helps. An appearance by the shotgun brings some mindless fun. The game never really gets slow; it is continuously intense. It's pretty neat that all this gameness is in a game for a portable.
Gameplay: 8/10
In terms of replay value, it does OK. The multiple difficulty settings and quick play mode up the ante, as well as single card. If you have friends who have this game, you'll easily get a few more hours out of it. The entire game, if you have friends who have it, and beat all difficulty settings, will get you about 20 hours. If you go solo, maybe 6-8 hours (beating the campaign one time only). I would recommend this to any DS owner who wants a good FPS other than MPH.
Overall: 7.5 out of 10.